asyncrat | 1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d

General

Target
1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
Size 45KB
Sample260804-shqlcacf72
SHA256 1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d
MD5 4b3c538ef0e209d75d02e2ca2e73124f
SHA1 09271a5399a0dfa72e8d603bfe3f21f40c697eee
SHA512 e9e44be6fd13399c318e5cae5ccf22732f809d4fa88c41844887b890d774981e0605dc729641603412da2bebf4e35407c1718118ef0f1b7a57a66cf4043ac583
SSDEEP 768:wuZ8pT1Uu4/cWUeT66mo2q1opt0CCMhdjCvS8PIjrjb2gX3iZRWeNclVBDZMx:wuZ8pT1tc2x/CChBj/bpXSZweal7dMx
TLSH
T1E7232A003BE9812BF2BE4F7869F25145867AF2637603D5491C8451DB5B23FC68A43AFD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

phimsexvnn.com:80
phimsexvnn.com:22
phimsexvnn.com:8080
phimsexvnn.com:8880
phimsexvnn.com:2052
phimsexvnn.com:2082
phimsexvnn.com:2086
phimsexvnn.com:2095
phimsexvnn.com:443
phimsexvnn.com:2053
phimsexvnn.com:2083
phimsexvnn.com:2087
phimsexvnn.com:2096
phimsexvnn.com:8443
www.phimsexvnn.com:80
www.phimsexvnn.com:22
www.phimsexvnn.com:8080
www.phimsexvnn.com:8880
www.phimsexvnn.com:2052
www.phimsexvnn.com:2082
www.phimsexvnn.com:2086
www.phimsexvnn.com:2095
www.phimsexvnn.com:443
www.phimsexvnn.com:2053
www.phimsexvnn.com:2083
www.phimsexvnn.com:2087
www.phimsexvnn.com:2096
www.phimsexvnn.com:8443
sasser.phimsexvnn.com:80
sasser.phimsexvnn.com:22
sasser.phimsexvnn.com:8080
sasser.phimsexvnn.com:8880
sasser.phimsexvnn.com:2052
sasser.phimsexvnn.com:2082
sasser.phimsexvnn.com:2086
sasser.phimsexvnn.com:2095
sasser.phimsexvnn.com:443
sasser.phimsexvnn.com:2053
sasser.phimsexvnn.com:2083
sasser.phimsexvnn.com:2087
sasser.phimsexvnn.com:2096
sasser.phimsexvnn.com:8443
nimda.phimsexvnn.com:80
nimda.phimsexvnn.com:22
nimda.phimsexvnn.com:8080
nimda.phimsexvnn.com:8880
nimda.phimsexvnn.com:2052
nimda.phimsexvnn.com:2082
nimda.phimsexvnn.com:2086
nimda.phimsexvnn.com:2095
nimda.phimsexvnn.com:443
nimda.phimsexvnn.com:2053
nimda.phimsexvnn.com:2083
nimda.phimsexvnn.com:2087
nimda.phimsexvnn.com:2096
nimda.phimsexvnn.com:8443

Mutex

ZHA5UlGFZ6lh

Attributes

delay
0
install
true
install_file
pu2a.exe
install_folder
%AppData%

aes.plain

Signatures

Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x000800000002467f-8.dat	family_asyncrat
behavioral1/memory/5556-10-0x0000000005620000-0x0000000005630000-memory.dmp	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe

Executes dropped EXE 2 IoCs

pid	Process
5556	pu2a.exe
432	pu2a.exe

Outbound SSH connection to public host 2 TTPs 4 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc	pid	Process
SSH destination	6	104.21.5.48:22	5556	pu2a.exe
SSH destination	11	172.67.132.249:22	5556	pu2a.exe
SSH destination	65	104.21.5.48:22	5556	pu2a.exe
SSH destination	73	172.67.132.249:22	5556	pu2a.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3976	cmd.exe
4684	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	pu2a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	pu2a.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5900	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5712	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
Token: SeDebugPrivilege	5556	pu2a.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4236 wrote to memory of 3976	4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe	86
PID 4236 wrote to memory of 4684	4236	1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe	88
PID 4684 wrote to memory of 5900	4684	cmd.exe	90
PID 3976 wrote to memory of 5712	3976	cmd.exe	91
PID 4684 wrote to memory of 432	4684	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe
"C:\Users\Admin\AppData\Local\Temp\1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4236
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "pu2a" /tr '"C:\Users\Admin\AppData\Roaming\pu2a.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3976
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "pu2a" /tr '"C:\Users\Admin\AppData\Roaming\pu2a.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5712
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB7.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4684
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5900
- - C:\Users\Admin\AppData\Roaming\pu2a.exe
    "C:\Users\Admin\AppData\Roaming\pu2a.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:432

C:\Users\Admin\AppData\Roaming\pu2a.exe
"C:\Users\Admin\AppData\Roaming\pu2a.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5556

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

1

T1572

Exfiltration

Impact

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tmpB7.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpB7.tmp.bat
Size 146B
SHA256 2952bd6a59a7291050b060c385044f130415b8890d19076c4211003e7a9615f8
MD5 3d25ea60f2f112eb7bbba299d2fa90e4
SHA1 c9e67901ad10fb154aed48c7e487f53fe3e1435d
SHA512 47339ae24309b63932d173058818ec479835392973879c998eb766c03d9f4f1799f4506c2601c1804d92bdb368ee3106e21b70f04193949bf89da3f291878dac
TLSH
T1C1C02B4352C6EA0F3C05145323FAD58CA1726D993F40FB10C304404E1680899F4DD345
MD5 SHA1 SHA512 TLSH

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pu2a.exe

Path C:\Users\Admin\AppData\Roaming\pu2a.exe
Size 45KB
SHA256 1a0f774b6ebd06382d8146894d7bbbb0ce0d823acee9430aa8809357e281153d
MD5 4b3c538ef0e209d75d02e2ca2e73124f
SHA1 09271a5399a0dfa72e8d603bfe3f21f40c697eee
SHA512 e9e44be6fd13399c318e5cae5ccf22732f809d4fa88c41844887b890d774981e0605dc729641603412da2bebf4e35407c1718118ef0f1b7a57a66cf4043ac583
SSDEEP 768:wuZ8pT1Uu4/cWUeT66mo2q1opt0CCMhdjCvS8PIjrjb2gX3iZRWeNclVBDZMx:wuZ8pT1tc2x/CChBj/bpXSZweal7dMx
TLSH
T1E7232A003BE9812BF2BE4F7869F25145867AF2637603D5491C8451DB5B23FC68A43AFD
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4236-0-0x00000000008C0000-0x00000000008D2000-memory.dmp

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memory/4236-1-0x0000000005180000-0x0000000005190000-memory.dmp

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memory/4236-2-0x0000000005190000-0x000000000522C000-memory.dmp

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memory/5556-10-0x0000000005620000-0x0000000005630000-memory.dmp

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memory/5556-13-0x0000000005620000-0x0000000005630000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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